CN117795384A - Apparatus and method for manufacturing diffractive optical element - Google Patents
Apparatus and method for manufacturing diffractive optical element Download PDFInfo
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- CN117795384A CN117795384A CN202280054126.XA CN202280054126A CN117795384A CN 117795384 A CN117795384 A CN 117795384A CN 202280054126 A CN202280054126 A CN 202280054126A CN 117795384 A CN117795384 A CN 117795384A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H1/041—Optical element in the object space affecting the object beam, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
- B29D11/00769—Producing diffraction gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1847—Manufacturing methods
- G02B5/1857—Manufacturing methods using exposure or etching means, e.g. holography, photolithography, exposure to electron or ion beams
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H2001/0439—Recording geometries or arrangements for recording Holographic Optical Element [HOE]
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/18—Prism
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Optical Elements Other Than Lenses (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Holo Graphy (AREA)
Abstract
The present disclosure provides an apparatus for manufacturing a diffractive optical element and a method for manufacturing a diffractive optical element, the apparatus comprising: a prism for manufacturing a diffractive optical element, the prism including a photoreactive material attachment surface and a light reflecting surface inclined at a predetermined angle with the photoreactive material attachment surface; and a light source positioned on an opposite side of the prism with respect to the photoreactive material attached to the photoreactive material attachment surface and configured to irradiate light toward the photoreactive material.
Description
Technical Field
The present specification claims priority and equity from korean patent application No. 10-2021-0093488 filed at korean intellectual property agency on day 7 and 16 of 2021, the entire contents of which are incorporated herein by reference.
The present disclosure relates to an apparatus and method for manufacturing a diffractive optical element, and more particularly, to an apparatus and method for manufacturing a diffractive optical element using a prism including a light reflecting surface.
Background
A diffractive optical element, such as a holographic optical element, is manufactured by causing two laser beams to interfere with each other, the two laser beams having the same wavelength and coherence length in a photoreactive material.
When a diffractive optical element is manufactured using two laser beams, it is greatly affected by an external environment such as vibration or air flow, which often causes problems with respect to reproducibility of the manufactured diffractive optical element.
Alternatively, after a master is manufactured in advance, a technique of using the master to replicate a diffractive optical element with a single laser beam has been developed, thereby realizing mass production of the diffractive optical element.
A laser beam is diffracted through the master to generate a reproducing light, and the original laser beam and the reproducing light passing through the master are interfered in a photoreactive material to undergo a process of reproducing the same diffractive optical element as the master. The following problems are continuously generated.
First, it is not easy to provide an optical system for manufacturing the reticle and to control the external environment, and it is difficult to enlarge the reticle itself due to limitations of a laser beam source and the optical system. Although it is indispensable for mass production to increase the area of the master, the maximum single-side length of the master that can be manufactured is only 100mm, so that several masters are used in a state in which they have been attached to the master in a tile attachment method.
In this case, a large number of masters are required to be manufactured uniformly, and continuous production is required due to the nature of the masters (which are consumables). In order to maintain consistent optical performance of the replicated diffractive optical element, the master should be made larger than the replicated diffractive optical element, which causes a reduction in chamfering efficiency during actual mass production, thereby adversely affecting yield.
Further, the replicated diffractive optical element depends on the performance of the master, and if a defect occurs during the fabrication of the master, there is a problem in that the defect of the master is also replicated to the diffractive optical element as it is.
Disclosure of Invention
Technical problem
It is an object of the present disclosure to provide a prism configured to manufacture a diffractive optical element.
It is another object of the present disclosure to provide an apparatus and method for manufacturing a diffractive optical element using a single light source without a master by using a prism.
However, the problems to be solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
Technical proposal
According to one aspect of the present disclosure, there is provided a prism for manufacturing a diffractive optical element, the prism comprising: a photoreactive material attachment surface; and a light reflecting surface inclined at a predetermined angle with the light reactive material attaching surface.
In the prism for manufacturing the diffractive optical element according to one embodiment of the present disclosure, the predetermined angle between the light reactive material attaching surface and the light reflecting surface may be determined by the following equation 1.
[ equation 1]
Wherein θ is P Is an angle between a light-reactive material attaching surface and a light-reflecting surface of a prism, θt is a first incident angle at which irradiated light is refracted at an interface between air and the light-reactive material and is incident into the light-reactive material when irradiated with the irradiated light from an opposite side of the prism with respect to the light-reactive material attached to the prism, θd is a second incident angle at which reflected light reflected from the light-reflecting surface is refracted at an interface between the prism and the light-reactive material and is incident into the light-reactive material when the irradiated light is transmitted through the light-reactive material, n pp Refractive index of photoreactive material, n p Corresponding to the refractive index of the prism.
When irradiation light is irradiated toward the photoreactive material from the opposite side of the prism with respect to the photoreactive material attached to the prism for manufacturing the diffractive optical element according to one embodiment of the present disclosure, a first incident angle θt at which the irradiation light is refracted at an interface between air and the photoreactive material and is incident into the photoreactive material may be equal to or less than a total reflection angle θc between the photoreactive material and air, and when irradiation light is transmitted through the photoreactive material, a second incident angle θd at which the reflected light reflected from the light reflection surface is refracted at the interface between the prism and the photoreactive material and is incident into the photoreactive material may be equal to or more than the total reflection angle θc.
In the prism for manufacturing the diffractive optical element according to one embodiment of the present disclosure, the predetermined angle between the light reactive material attaching surface and the light reflecting surface may be determined by the following equation 2.
[ equation 2]
Wherein θp is an angle between the light-reactive material attaching surface of the prism and the light-reflecting surface, θi is an irradiation angle at which the irradiation light is incident to an interface between air and the light-reactive material when the irradiation light is irradiated from an opposite side of the prism with respect to the light-reactive material attached to the prism toward the light-reactive material, θd is a second incident angle at which the reflected light reflected from the light-reflecting surface is refracted at the interface between the prism and the light-reactive material and is incident into the light-reactive material when the irradiation light is transmitted through the light-reactive material, n pp Refractive index n of photoreactive material p Is the refractive index of the prism, n Air-conditioner Corresponding to the refractive index of air.
The light reflecting surface of the prism for manufacturing the diffractive optical element according to one embodiment of the present disclosure may include a mirror coated surface or a mirror deposited surface.
A prism for manufacturing a diffractive optical element according to one embodiment of the present disclosure may have a triangular pillar shape.
According to another aspect of the present disclosure, there is provided an apparatus for manufacturing a diffractive optical element, the apparatus comprising: a prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with the photoreactive material attachment surface; and a light source positioned on an opposite side of the prism with respect to the photoreactive material attached to the photoreactive material attachment surface and configured to irradiate light toward the photoreactive material.
In the apparatus for manufacturing a diffractive optical element according to the embodiment of the present disclosure, interference fringes may be formed on a photoreactive material by causing illumination light, which is illuminated from a light source and refracted at an interface between air and the photoreactive material, to interfere with reflected light, and then is incident into the photoreactive material, wherein when the illumination light is transmitted through the photoreactive material, the reflected light is reflected from a light reflecting surface and refracted at the interface between a prism and the photoreactive material, and is incident into the photoreactive material.
In the prism of the apparatus for manufacturing the diffractive optical element according to the embodiment of the present disclosure, the predetermined angle between the light reactive material attaching surface and the light reflecting surface may be determined by the following equation 1.
[ equation 1]
Wherein θp is an angle between the light-reactive material attaching surface and the light-reflecting surface of the prism, θt is a first incident angle at which the irradiation light is refracted at an interface between air and the light-reactive material and is incident into the light-reactive material when the irradiation light is irradiated from an opposite side of the prism with respect to the light-reactive material attached to the prism toward the light-reactive material, θd is a second incident angle at which the reflected light reflected from the light-reflecting surface is refracted at an interface between the prism and the light-reactive material and is incident into the light-reactive material when the irradiation light is transmitted through the light-reactive material, n pp Refractive index of photoreactive material, n p Corresponding to the refractive index of the prism.
In the apparatus for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the first incident angle θt at which the irradiation light irradiated from the light source is refracted at the interface between the air and the photoreactive material and is incident into the photoreactive material may be equal to or smaller than the total reflection angle θc between the photoreactive material and the air, and the second incident angle θd at which the reflection light reflected from the light reflection surface is refracted at the interface between the prism and the photoreactive material and is incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material may be equal to or larger than the total reflection angle θc.
In the prism of the apparatus for manufacturing the diffractive optical element according to the embodiment of the present disclosure, the predetermined angle between the light reactive material attaching surface and the light reflecting surface may be determined by the following equation 2.
[ equation 2]
Wherein θp is an angle between the light-reactive material attaching surface of the prism and the light-reflecting surface, θi is an irradiation angle at which the irradiation light is incident to an interface between air and the light-reactive material when the irradiation light is irradiated from an opposite side of the prism with respect to the light-reactive material attached to the prism toward the light-reactive material, θd is a second incident angle at which the reflected light reflected from the light-reflecting surface is refracted at the interface between the prism and the light-reactive material and is incident into the light-reactive material when the irradiation light is transmitted through the light-reactive material, n pp Refractive index n of photoreactive material p Is the refractive index of the prism, n Air-conditioner Corresponding to the refractive index of air.
The apparatus for manufacturing a diffractive optical element according to an embodiment of the present disclosure may further include a transmission mechanism configured to transmit the photoreactive material or the prism such that the photoreactive material is attached to the photoreactive material attachment surface of the prism.
In the apparatus for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the photoreactive material may be formed in the form of a sheet having a predetermined size in the width direction and extending in the length direction, and the transport mechanism may include a transport roller configured to continuously transport the sheet of the photoreactive material.
The photoreactive material attachment surface of the prism of the apparatus for manufacturing a diffractive optical element according to the embodiment of the present disclosure may have a size corresponding to a width direction size of the photoreactive material.
In the apparatus for manufacturing a diffractive optical element according to the embodiment of the present disclosure, interference fringes may be continuously formed in any one of the width direction, the length direction, and the oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
According to yet another aspect of the present disclosure, there is provided an apparatus for manufacturing a diffractive optical element, the apparatus comprising: a prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with the photoreactive material attachment surface; and a light source positioned on an opposite side of the prism with respect to the photoreactive material attached to the photoreactive material attachment surface and configured to irradiate light toward the photoreactive material, wherein the diffractive optical element can be manufactured with only one light source without the master by causing the irradiation light to interfere with the reflected light, the irradiation light being irradiated from the light source, wherein when the irradiation light is transmitted through the photoreactive material, the reflected light is reflected from the light reflection surface.
According to yet another aspect of the present disclosure, there is provided a method for manufacturing a diffractive optical element, the method comprising the steps of: preparing a prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with respect to the photoreactive material attachment surface; attaching a photoreactive material on which interference fringes are to be recorded to a prism; and recording interference fringes by irradiating light toward the photoreactive material from a light source positioned at an opposite side of the prism with respect to the photoreactive material.
In the step of preparing a prism in the method for manufacturing a diffractive optical element according to the embodiment of the present disclosure, a predetermined angle between the light reactive material attaching surface of the prism and the light reflecting surface may be determined by the following equation 1.
[ equation 1]
Wherein θp is an angle between the light-reactive material attaching surface and the light-reflecting surface of the prism, θt is a first incident angle at which the irradiated light is refracted at an interface between air and the light-reactive material and is incident into the light-reactive material when the irradiated light is irradiated from an opposite side of the prism with respect to the light-reactive material attached to the prism toward the light-reactive material, θd is a reflected light reflected from the light-reflecting surface between the prism and the light-reactive material when the irradiated light is transmitted through the light-reactive material A second incident angle, n, refracted at the interface of and incident into the photoreactive material pp Refractive index of photoreactive material, n p Corresponding to the refractive index of the prism.
In the step of preparing a prism in the method for manufacturing a diffractive optical element according to the embodiment of the present disclosure, a predetermined angle between the light reactive material attaching surface of the prism and the light reflecting surface may be determined by the following equation 2.
[ equation 2]
Wherein θp is an angle between the light-reactive material attaching surface of the prism and the light-reflecting surface, θi is an irradiation angle at which the irradiation light is incident to an interface between air and the light-reactive material when the irradiation light is irradiated from an opposite side of the prism with respect to the light-reactive material attached to the prism toward the light-reactive material, θd is a second incident angle at which the reflected light reflected from the light-reflecting surface is refracted at the interface between the prism and the light-reactive material and is incident into the light-reactive material when the irradiation light is transmitted through the light-reactive material, n pp Refractive index n of photoreactive material p Is the refractive index of the prism, n Air-conditioner Corresponding to the refractive index of air.
In the step of recording the interference fringes in the method for manufacturing the diffractive optical element according to the embodiment of the present disclosure, the interference fringes may be formed on the photoreactive material by causing the irradiation light, which is irradiated from the light source and refracted at the interface between the air and the photoreactive material, to be incident into the photoreactive material, wherein when the irradiation light is transmitted through the photoreactive material, the reflected light is reflected from the light reflecting surface and refracted at the interface between the prism and the photoreactive material, and is incident into the photoreactive material.
In the step of recording interference fringes in the method for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the first incident angle θt at which the irradiation light irradiated from the light source is refracted at the interface between the air and the photoreactive material and is incident into the photoreactive material may be equal to or smaller than the total reflection angle θc between the photoreactive material and the air, and the second incident angle θd at which the reflection light reflected from the light reflection surface is refracted at the interface between the prism and the photoreactive material and is incident into the photoreactive material may be equal to or larger than the total reflection angle θc when the irradiation light is transmitted through the photoreactive material.
In the step of recording the interference fringes in the method for manufacturing the diffractive optical element according to the embodiment of the present disclosure, the interference fringes may be continuously formed in any one of the width direction, the length direction, and the oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
The method for manufacturing a diffractive optical element according to an embodiment of the present disclosure may further include the steps of: the photoreactive material or prism is transmitted such that the photoreactive material is attached to a photoreactive material attachment surface of the prism.
In the method for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the photoreactive material may be formed in the form of a sheet having a predetermined size in the width direction and extending in the length direction, and the sheet of photoreactive material may be continuously transferred in the step of transferring the photoreactive material.
The method for manufacturing a diffractive optical element according to an embodiment of the present disclosure may further include the steps of: a plurality of diffraction optical elements having a predetermined size are cut along any one of a width direction, a length direction, and an oblique direction of a photoreactive material having interference fringes recorded thereon, the oblique direction forming a predetermined angle with the width direction or the length direction.
The diffractive optical element manufactured by the method for manufacturing a diffractive optical element according to the embodiment of the present disclosure may be a holographic optical element.
The photoreactive material on which interference fringes are recorded by causing irradiation light, which is irradiated from a light source by an apparatus for manufacturing a diffractive optical element according to an embodiment of the present disclosure, to interfere with reflected light may be formed in a sheet form, wherein when the irradiation light is transmitted through the photoreactive material, the reflected light is reflected from the light reflecting surface, and the interference fringes may be continuously formed in any one of a width direction, a length direction, and an oblique direction, which forms a predetermined angle with the width direction or the length direction of the photoreactive material.
The photoreactive material on which the interference fringes are recorded by the method for manufacturing the diffractive optical element according to the embodiment of the present disclosure may be formed in the form of a sheet, and the interference fringes may be continuously formed in any one of a width direction, a length direction, and an oblique direction forming a predetermined angle with the width direction or the length direction of the photoreactive material.
Advantageous effects
According to the present disclosure, by using a prism having a light reflection surface to cause illumination light irradiated from a light source to interfere with reflected light reflected from the light reflection surface of the prism, a diffractive optical element can be manufactured with one light source without using a master.
Therefore, the master which is a consumable need not be continuously produced, and a case where a defect of the master is duplicated in the diffractive optical element as it is can be prevented.
Further, the apparatus for manufacturing a diffractive optical element according to the present disclosure may be implemented as a roll-to-roll apparatus, thereby mass-producing diffractive optical elements having uniform properties.
Further, since the prism of the apparatus for manufacturing a diffractive optical element according to the present disclosure can be manufactured in a large area, chamfering efficiency can be improved during mass production of the diffractive optical element.
Meanwhile, since interference fringes are not recorded in the gaps between masters when the diffraction optical element is manufactured using a conventional tiling attachment master, intermittent interference fringes are formed on the photoreactive material, and when dicing is performed, particularly when oblique dicing is performed, dicing efficiency is lowered.
In contrast, according to the present disclosure, interference fringes can be continuously formed on the photoreactive material, thereby greatly improving cutting efficiency.
Effects of the present disclosure are not limited to the above-described effects, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and drawings.
Drawings
Fig. 1 is a diagram illustrating a concept of manufacturing a diffractive optical element according to one embodiment of the present disclosure.
Fig. 2 is a cross-sectional view showing an optical path length of illumination light in an apparatus for manufacturing a diffractive optical element according to one embodiment of the present disclosure.
Fig. 3 is a perspective view illustrating a prism of an apparatus for manufacturing a diffractive optical element according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram illustrating an apparatus for manufacturing a diffractive optical element according to another embodiment of the present disclosure.
Fig. 5a is a graph showing transmittance according to wavelength of a diffractive optical element manufactured according to an embodiment of the present disclosure.
Fig. 5b is a graph showing the reflectance according to wavelength of a diffractive optical element fabricated according to an embodiment of the present disclosure.
Fig. 6a is a graph showing transmittance according to wavelength of a diffractive optical element manufactured according to a comparative example of the present disclosure.
Fig. 6b is a graph showing the reflectance according to wavelength of the diffractive optical element manufactured according to the comparative example of the present disclosure.
[ description of reference numerals ]
1: apparatus for manufacturing diffractive optical element
2: photoreactive material
10: prism for manufacturing diffractive optical element
11: photoreactive material attachment surface
12: light reflecting surface
20: light source
30: transmission mechanism
40: supply roller
50: recovery roller
La: irradiation light
Lb: reflected light
θp: angle between the optically-reactive material attachment surface and the light-reflecting surface of the prism
Detailed Description
The present disclosure will become apparent with reference to the following detailed description of embodiments taken in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but will be embodied in various different forms. These embodiments are provided only for complete disclosure of the present disclosure and to fully inform the scope of the present disclosure to those ordinarily skilled in the art, and the present disclosure is limited only by the scope of the claims. Meanwhile, the terminology used in the present specification is for the purpose of describing embodiments, and is not intended to limit the present disclosure.
Throughout this specification, singular forms also include plural forms unless the phrase clearly dictates otherwise.
The terms "comprises/comprising" and/or "includes/including" are used throughout the specification to denote the presence of a stated element, step, operation and/or component, but do not preclude the presence or addition of one or more other elements, steps, operations and/or components. Unless specifically stated otherwise, these terms are intended to include, rather than exclude, additional constituent elements.
Throughout this specification, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by these terms. These terms are only used for distinguishing one component from another.
Throughout this specification, the term "diffractive optical element" means an optical element having a diffraction grating pattern as follows: wherein the high refractive portions and the low refractive portions are alternately arranged in a predetermined direction, and light reaching the diffractive optical element can be diffracted such that the optical path length thereof is changed.
Throughout this specification, the term "holographic diffractive optical element" refers to an optical element having a holographic grating pattern of: wherein the high refractive portions and the low refractive portions are alternately arranged in a predetermined direction, and light reaching the hologram diffraction optical element may be diffracted such that an optical path thereof is changed. Such holographic grating patterns may be recorded by causing a plurality of lasers to interfere with each other on a photosensitive material such as a photopolymer.
Hereinafter, the present disclosure will be described in more detail.
Fig. 1 to 4 show the configuration and operation of an apparatus for manufacturing a diffractive optical element according to one embodiment of the present disclosure, fig. 1 is a diagram showing the concept of manufacturing a diffractive optical element according to one embodiment of the present disclosure, fig. 2 is a sectional view showing the optical path of illumination light in the apparatus for manufacturing a diffractive optical element, fig. 3 is a perspective view showing a prism of the apparatus for manufacturing a diffractive optical element, and fig. 4 is a schematic view showing the apparatus for manufacturing a diffractive optical element.
An apparatus 1 for manufacturing a diffractive optical element according to an embodiment of the present disclosure will be described with reference to fig. 1 to 4. The apparatus 1 for manufacturing a diffractive optical element according to one embodiment of the present disclosure may manufacture a diffractive optical element by irradiating light to the photoreactive material 2 and causing the light to interfere with the photoreactive material 2 to record interference fringes.
The apparatus 1 for manufacturing a diffractive optical element according to an embodiment of the present disclosure is configured to include: a light source 20 and a prism 10, the light source 20 being configured to irradiate light to the photoreactive material 2, the prism 10 being configured to interfere with the light irradiated from the light source 20.
More specifically, the prism 10 for manufacturing the diffractive optical element may be configured to include: a photoreactive material attachment surface 11 on which the photoreactive material 2 is attached, and a light reflection surface inclined at a predetermined angle θp with the photoreactive material attachment surface 11.
The light source 20 may be positioned at an opposite side of the prism 10 with respect to the photoreactive material 2 attached to the photoreactive material attachment surface 11 and may be configured to irradiate light toward the photoreactive material 2.
As shown in fig. 1, an apparatus 1 for manufacturing a diffractive optical element according to an embodiment of the present disclosure can manufacture a diffractive optical element with only one light source without a master by irradiating light to a photoreactive material 2 attached to a prism 10 and causing the irradiation light La, which is irradiated from a light source 20 when the irradiation light La is transmitted through the photoreactive material 2, to interfere with reflected light Lb to record interference fringes on the photoreactive material 2, the reflected light being reflected from a light reflecting surface 12.
An optical path for recording interference fringes on a photoreactive material 2 using an apparatus 1 for manufacturing a diffractive optical element according to an embodiment of the present disclosure will be described with reference to fig. 2. The irradiation light La irradiated from the light source 20 at the predetermined irradiation angle θi is refracted at the interface between the air and the photoreactive material 2 and is incident into the photoreactive material 2, and the incident angle at this time may be referred to as a first incident angle θt.
After transmitting through the photoreactive material 2 and reflecting from the light reflecting surface 12, the irradiation light La is refracted at the interface between the prism 10 and the photoreactive material 2, and then is incident into the photoreactive material 2. The light after being reflected from the light reflection surface 12 will be referred to as reflected light Lb, and the incident angle at this time may be referred to as a second incident angle θd.
On the other hand, the irradiation light La and the reflected light Lb are light generated from one light source 20, and after the irradiation light La is reflected from the light reflection surface 12 of the prism 10, the irradiation light La becomes the reflected light Lb. The irradiation light La and the reflected light Lb interfere with each other to form interference fringes on the photoreactive material 2, thereby making it possible to manufacture a diffractive optical element.
In the apparatus 1 for manufacturing a diffractive optical element according to the embodiment of the present disclosure, in order to form interference fringes by interfering the reflected light Lb reflected from the light reflecting surface 12 of the prism 10 along the optical path with the irradiation light La irradiated from the light source 20, it is preferable that a first incident angle θt when the irradiation light La is refracted at the interface between air and the photoreactive material 2 and is incident into the photoreactive material 2 and a second incident angle θd when the reflected light La is refracted at the interface between the prism 19 and the photoreactive material 2 and is incident into the photoreactive material 2 each satisfy a predetermined relationship with the total reflection angle θc between the photoreactive material 2 and air.
Specifically, if the first incident angle θt becomes equal to or smaller than the total reflection angle θc, and the second incident angle θd becomes equal to or larger than the total reflection angle θc, the irradiation light La and the reflected light Lb may interfere with each other within the photoreactive material 2 to form interference fringes.
From another point of view, in order to adjust the angle of two lights required to be incident into the photoreactive material 2 to manufacture the diffractive optical element, the angle of the prism 10, that is, the angle between the photoreactive material attachment surface 11 and the light reflection surface 12 of the prism 10 can be determined by the following [ equation 1 ].
[ equation 1]
Where θp is an angle between the light-reactive material attaching surface 11 and the light-reflecting surface 12 of the prism 10, θt is a first incident angle at which the irradiation light La irradiated from the light source 20 is refracted at the interface between the air and the light-reactive material 2 and is incident into the light-reactive material 2, θd is a second incident angle at which the reflected light Lb reflected from the light-reflecting surface 12 is refracted at the interface between the prism 10 and the light-reactive material 2 and is incident into the light-reactive material 2 when the irradiation light La is transmitted through the light-reactive material 2, n pp Is the refractive index of the photoreactive material 2, n p Corresponding to the refractive index of the prism 10.
If the angle at which the irradiation light irradiated from the light source 20 is incident on the interface between the air and the photoreactive material is defined as the irradiation angle θi, the first incident angle θt may be replaced by the irradiation angle θi using Snell's law, and [ equation 1] is changed as shown in the following [ equation 2], so that the angle θp of the prism 10 may be expressed as a relationship between the irradiation angle θi and the second incident angle θd.
[ equation 2]
Where θp is an angle between the light-reactive material attaching surface 11 and the light-reflecting surface 12 of the prism 10, θi is an irradiation angle at which the irradiation light La irradiated from the light source 20 is incident to an interface between air and the light-reactive material 2, θd is a second incident angle at which the reflected light Lb reflected from the light-reflecting surface 12 is refracted at the interface between the prism 10 and the light-reactive material 2 and is incident into the light-reactive material 2 when the irradiation light La is transmitted through the light-reactive material 2, n pp Refractive index n of photoreactive material 2 p Is the refractive index of the prism 10, n Air-conditioner Corresponding to the refractive index of air.
The light reflecting surface 12 of the prism 10 for manufacturing the diffractive optical element according to the embodiment of the present disclosure may be configured to reflect the mirror surface incident into the prism 10 after passing through the photoreactive material attachment surface 11, and form a mirror coated surface or a mirror deposited surface via coating or deposition, but the present disclosure is not limited thereto. Light reflecting surface 12 may also be achieved by attaching a reflective optical element to prism 10, and any configuration is possible as long as it can reflect light incident on prism 10 and reaching light reflecting surface 12.
As shown in fig. 3, a prism 10 for manufacturing a diffractive optical element according to an embodiment of the present disclosure may have a triangular pillar shape, and one side surface of the triangular pillar may become a photoreactive material attachment surface 11, and the other side surface adjacent thereto may become a light reflection surface 12. However, the present disclosure is not limited thereto, and any configuration is possible as long as it satisfies a predetermined angular relationship with the photoreactive material attachment surface 11 and includes the light reflection surface 12 adjacent thereto.
The prism 10 for manufacturing the diffractive optical element according to the embodiment of the present disclosure may be made of quartz, BK7, or poly (methyl methacrylate) (PMMA), but is not limited thereto.
In the apparatus 1 for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the light source 20 may be a laser beam source, and may be configured to irradiate one kind of light having a predetermined wavelength and a coherence length.
Here, the meaning of "a" or "an" means that the irradiation light La and the reflected light Lb are generated by the "same" light source, in addition to the light source being physically one.
According to embodiments of the present disclosure, the photoreactive material may include a photoreactive material, and may be formed in various shapes having a predetermined width and/or length direction size, such as a sheet shape or a roll shape. Various types of photosensitive materials that can be used to fabricate diffractive optical elements, including holographic optical elements, are well known, and these materials can even be used in the present disclosure without limitation.
According to embodiments of the present disclosure, photopolymers, photoresists, silver halide emulsions, dichromated gelatins, photographic emulsions, photo-thermoplastics, or photorefractive materials may be used as photosensitive materials. Interference fringes can be easily recorded using the above photosensitive material.
The diffractive optical element manufactured according to embodiments of the present disclosure may be a holographic optical element.
The apparatus 1 for manufacturing a diffractive optical element according to an embodiment of the present disclosure may be configured as a roll-to-roll apparatus to mass-produce the diffractive optical element.
This will be described in more detail with reference to fig. 4.
In the apparatus 1 for manufacturing a diffractive optical element according to the embodiment of the present disclosure, the photoreactive material 2 may be formed in the form of a sheet having a predetermined size in the width direction and extending in the length direction. At this time, the width direction dimension of the photoreactive material 2 may be configured to be 500mm or more, but is not limited thereto, and may be differently set according to the size of the diffractive optical element to be produced.
The sheet-like photoreactive material 2 may be supplied from a supply roller 40 wound in a roll shape, and the sheet-like photoreactive material 2 having interference fringes recorded thereon and manufactured as a diffractive optical element may be wound by a recovery roller 50 to be recovered in a roll form.
When the sheet-like photoreactive material 2 is supplied to the apparatus 1 for manufacturing the diffractive optical element, a transfer mechanism 30 configured to transfer the photoreactive material 2 such that the photoreactive material 2 is attached to the photoreactive material attachment surface 11 of the prism 10 may be installed, and the transfer mechanism 30 may be configured in the form of a transfer roller that continuously transfers the sheet of the photoreactive material 2.
In addition to the photoreactive material 2, the transmission mechanism 50 may be configured to transmit the prism 10.
Further, the photoreactive material attachment surface 11 of the prism 10 for manufacturing a diffractive optical element according to an embodiment of the present disclosure may be configured to correspond to the widthwise dimension of the sheet-shaped photoreactive material 2.
With this configuration, the chamfering efficiency during production of the diffractive optical element from the photoreactive material 2 can be greatly improved as compared with the case where a master as a conventional technique is used, and thus it is effective.
Due to laser and optical limitations, masters of conventional technology cannot be manufactured in large areas, so that for mass production, several masters must be attached to a substrate in a tiled fashion for use. In this way, when a plurality of masters are attached in a tiled manner, there is a problem in that chamfering efficiency is reduced during production of the diffractive optical element.
On the other hand, since the prism 10 for manufacturing the diffractive optical element according to the embodiment of the present disclosure can be manufactured in a large area having a side length of 500mm or more, the prism 10 can prevent a reduction in chamfering efficiency that occurs when a plurality of masters are attached in a tiled manner as in the conventional art.
The sheet-like photoreactive material 2 on which interference fringes are recorded by the prism 10 may be subjected to a process of cutting the sheet-like photoreactive material 2 into individual diffractive optical elements each having a predetermined size.
Such cutting may be performed in the width direction, the length direction, or the oblique direction of the sheet-like photoreactive material 2, the oblique direction forming a predetermined angle with the width direction or the length direction.
Here, it is necessary to effectively cut the sheet-like photoreactive material 2 so that as many individual diffractive optical elements as possible are arranged within a unit size (e.g., 500mm×500 mm) of the sheet-like photoreactive material 2.
The sum of the areas of the individual diffractive optical elements arranged per unit area with respect to the sheet-like photoreactive material 2 is defined as the dicing efficiency, and the production yield can be improved by improving the dicing efficiency.
The cutting efficiency of the diffractive optical element manufactured according to the embodiments of the present disclosure is higher than that of the diffractive optical element manufactured using the conventional tiling attachment master, and in particular, in the case of oblique-direction cutting, the difference in cutting efficiency between the two inventions becomes much larger.
When a conventional tiling attachment type master is used, a physical gap occurs between masters as the masters are attached to the master in a tiled manner. Interference fringes cannot be recorded in such physical gaps, so that the interference fringes recorded on the photoreactive material sheet before dicing are not continuously formed, but are intermittently recorded with gaps between masters.
Such intermittent interference fringes have an adverse effect on improving cutting efficiency.
Meanwhile, according to the embodiment of the present disclosure, since interference fringes can be continuously recorded on the sheet-shaped photoreactive material 2, a significantly improved cutting efficiency can be obtained as compared with the conventional art
According to the embodiments of the present disclosure, interference fringes may be continuously formed in a width direction, a length direction, or an oblique direction of the sheet-shaped photoreactive material 2, the oblique direction forming a predetermined angle with the width direction or the length direction, and individual diffractive optical elements may be arranged and cut using the entire area within a unit size of the sheet-shaped photoreactive material 2.
According to yet another embodiment of the present disclosure, a method for manufacturing a diffractive optical element comprises the steps of: preparing a prism 10, the prism 10 including a photoreactive material attachment surface 11 and a light reflection surface 12 inclined at a predetermined angle θp with the photoreactive material attachment surface 11; attaching a photoreactive material 2 to the prism 10, on which photoreactive material 2 interference fringes are to be recorded; and recording interference fringes by irradiating light from a light source 20 toward the photoreactive material 2, the light source 20 being positioned on the opposite side of the prism 10 with respect to the photoreactive material 2.
In the step of preparing the prism 10, the prism 10 may have the same configuration as that of the apparatus 1 for manufacturing a diffractive optical element according to the foregoing embodiment.
In the step of recording interference fringes after the step of attaching the photoreactive material 2 to the prism 10, the irradiation light La and the reflected light Lb may interfere with each other to form interference fringes on the photoreactive material 2, the irradiation light La being irradiated from the light source 20 and refracted at the interface between air and the photoreactive material 2, and then being incident into the photoreactive material 2, wherein when the irradiation light La is transmitted through the photoreactive material 2, the reflected light Lb is reflected from the light reflection surface 12 and refracted at the interface between the prism 10 and the photoreactive material 2, and is incident into the photoreactive material 2.
The method for manufacturing a diffractive optical element according to an embodiment of the present disclosure may further include the steps of: transmitting the photoreactive material 2 or the prism 10 causes the photoreactive material 2 to be attached to the photoreactive material attachment surface 11 of the prism 10, which makes it possible to continuously supply the photoreactive material 2 to manufacture the diffractive optical element.
In this case, the photoreactive material 2 may be configured in a sheet shape having a predetermined widthwise dimension and extending in a lengthwise direction, so that sheets of photoreactive material may be continuously transferred.
A method for manufacturing a diffractive optical element according to an embodiment of the present disclosure may include a step of cutting a sheet-shaped photoreactive material 2 having interference fringes recorded thereon into a plurality of diffractive optical elements.
Such cutting may be performed in the width direction, the length direction, or the oblique direction of the sheet-like photoreactive material 2, the oblique direction forming a predetermined angle with the width direction or the length direction.
According to the embodiment of the present disclosure, in the step of recording interference fringes, the interference fringes may be continuously recorded on the sheet-shaped photoreactive material 2.
More specifically, since the interference fringes are continuously formed in the width direction, the length direction, or the oblique direction (the oblique direction forms a predetermined angle with the width direction or the length direction) of the sheet-like photoreactive material 2, it is possible to arrange and cut individual diffractive optical elements with the entire area within the unit size of the sheet-like photoreactive material 2, which makes it possible to improve the cutting efficiency.
Examples
After preparing the apparatus 1 for manufacturing a diffractive optical element according to the embodiment of the present disclosure to attach the photoreactive material 2 to the photoreactive material attachment surface 11 of the prism 10, the irradiation light La is incident from the light source 20 at an irradiation angle θi of 60 °, and then the second incident angle θd of the reflected light Lb reflected from the light reflection surface 12 of the prism 10 is set to 66 °, so that the irradiation light La interferes with the reflected light Lb, thereby manufacturing the diffractive optical element.
Here, a laser beam source having a wavelength of 660nm and a coherence length of 2m was used as the light source 20, a photopolymer was used as the photoreactive material 2, and θp of the prism 10 was set to 15 °.
The optical properties of the manufactured diffractive optical element are shown in fig. 5a and 5 b.
Fig. 5a and 5b are graphs obtained by measuring the efficiency of a diffractive optical element manufactured according to an embodiment of the present disclosure. Fig. 5a is a graph showing transmittance according to wavelength of a diffractive optical element manufactured according to an embodiment of the present disclosure, and fig. 5b is a graph showing reflectance according to wavelength of a diffractive optical element manufactured according to an embodiment of the present disclosure.
According to fig. 5a and 5b, when light is incident to the diffractive optical element according to an embodiment of the present disclosure at 0 °, it is diffracted at 50 °, and exhibits a peak wavelength of 986nm, a transmittance of 39.7%, and a reflectance of 49.9%.
Comparative example
An apparatus for manufacturing a diffractive optical element according to a comparative example of the present disclosure was prepared. Unlike the apparatus for manufacturing the diffractive optical element according to the embodiment of the present disclosure, a master, not a prism, according to the conventional art is manufactured, and a master plate is manufactured. The configuration other than the motherboard is configured in the same manner as in the embodiments of the present disclosure.
More specifically, a photopolymer was used as a master, and a laser beam source having a wavelength of 660nm and a coherence length of 2m was used as a light source, and the master was manufactured by separating the light source into two light sources and causing the two light sources to interfere with each other.
After attaching the photoreactive material to the photoreactive material attachment surface of the master, irradiation light is incident from a light source at an irradiation angle of 60 °, and then an incidence angle of diffracted light diffracted from the master is set to 66 ° so that the irradiation light and the diffracted light interfere with each other, thereby manufacturing a replicated diffractive optical element identical to the master on the photoreactive material.
Here, a laser beam source having a wavelength of 660nm and a coherence length of 2m is used as a light source, and a photopolymer is used as the photoreactive material 2.
The optical characteristics of the diffractive optical element manufactured according to the comparative example are shown in fig. 6a and 6 b.
Fig. 6a and 6b are graphs obtained by measuring the efficiency of the diffractive optical element manufactured according to the comparative example of the present disclosure. Fig. 6a is a graph showing transmittance according to wavelength of a diffractive optical element manufactured according to a comparative example of the present disclosure, and fig. 6b is a graph showing reflectance according to wavelength of a diffractive optical element manufactured according to a comparative example of the present disclosure.
According to fig. 6a and 6b, when light is incident at 0 ° to the diffractive optical element according to the comparative example of the present disclosure, it is diffracted at 50 ° and exhibits a peak wavelength of 987nm, a transmittance of 46.0% and a reflectance of 44.8%.
Accordingly, when comparing the measurement data according to the embodiment of the present disclosure with the measurement data according to the comparative example, the embodiment can manufacture a diffractive optical element having an efficiency about 5% or more higher than the comparative example.
While the present disclosure has been described with respect to the limited embodiments, the present disclosure is not limited thereto, and various changes and modifications may be made by those skilled in the art to which the present disclosure pertains within the technical spirit of the present disclosure and the scope equivalent to the appended claims.
Claims (28)
1. A prism for manufacturing a diffractive optical element, the prism comprising a photoreactive material attachment surface and a light reflecting surface inclined at a predetermined angle to the photoreactive material attachment surface.
2. The prism of claim 1 wherein the predetermined angle is determined by equation 1,
[ equation 1]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface t When irradiation light is irradiated toward the photoreactive material from the opposite side of the prism with respect to the photoreactive material attached to the prism, the irradiation light is refracted at the interface between air and the photoreactive material and is incident into the photoreactive material at a first incident angle, θ d A second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp Refractive index of the photoreactive material, and n p Corresponding to the refractive index of the prism.
3. The prism of claim 1 wherein when viewed from the prismWhen the opposite side of the prism with respect to the photoreactive material attached thereto irradiates irradiation light toward the photoreactive material, the irradiation light is refracted at an interface between air and the photoreactive material and is incident into a first incident angle θ in the photoreactive material t Equal to or less than the total reflection angle theta between the photoreactive material and air c And a second incident angle theta at which the reflected light reflected from the light reflecting surface is refracted at the interface between the prism and the photoreactive material and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material d Equal to or greater than the total reflection angle theta c 。
4. The prism of claim 1 wherein the predetermined angle is determined by equation 2,
[ equation 2]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface i An irradiation angle, θ, at which irradiation light is incident on an interface between air and a photoreactive material attached to the prism when the irradiation light is irradiated toward the photoreactive material from an opposite side of the prism to the photoreactive material d A second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp N, the refractive index of the photoreactive material p For the refractive index of the prism, n Air-conditioner Corresponding to the refractive index of air.
5. The prism of claim 1, wherein the light reflecting surface comprises a mirror coated surface or a mirror deposited surface.
6. The prism of claim 1, wherein the prism has a triangular prism shape.
7. An apparatus for manufacturing a diffractive optical element, the apparatus comprising:
A prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with the photoreactive material attachment surface; and
a light source positioned on an opposite side of the prism from the photoreactive material attached to the photoreactive material attachment surface and configured to illuminate light toward the photoreactive material.
8. The apparatus of claim 7, wherein interference fringes are formed on the photoreactive material by causing illumination light, which is illuminated from the light source and refracted at an interface between air and the photoreactive material, to interfere with reflected light, which is reflected from the light reflecting surface and refracted at an interface between the prism and the photoreactive material, and is incident into the photoreactive material when the illumination light is transmitted through the photoreactive material.
9. The apparatus of claim 7, wherein the predetermined angle is determined by the following equation 1,
[ equation 1]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface t For a first incident angle at which the irradiation light irradiated from the light source is refracted at the interface between air and the photoreactive material and is incident into the photoreactive material,θ d a second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp Refractive index of the photoreactive material, and n p Corresponding to the refractive index of the prism.
10. The apparatus according to claim 7, wherein the irradiation light irradiated from the light source is refracted at an interface between air and the photoreactive material and is incident into the photoreactive material at a first incident angle θ t Equal to or less than the total reflection angle theta between the photoreactive material and air c And a second incident angle theta at which the reflected light reflected from the light reflecting surface is refracted at the interface between the prism and the photoreactive material and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material d Equal to or greater than the total reflection angle theta c 。
11. The apparatus of claim 7, wherein the predetermined angle is determined by the following equation 2,
[ equation 2]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface i An irradiation angle θ at which irradiation light irradiated from the light source is incident on an interface between air and the photoreactive material d A second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp N, the refractive index of the photoreactive material p Is a fold of the prismEmissivity, n Air-conditioner Corresponding to the refractive index of air.
12. The apparatus of claim 7, further comprising a transport mechanism configured to transport the photoreactive material or the prism such that the photoreactive material is attached to the photoreactive material attachment surface of the prism.
13. The apparatus of claim 12, wherein the photoreactive material is formed in the form of a sheet having a predetermined size in a width direction and extending in a length direction, and the transport mechanism includes a transport roller configured to continuously transport the sheet of photoreactive material.
14. The apparatus of claim 7, wherein the photoreactive material attachment surface of the prism has a size corresponding to a widthwise dimension of the photoreactive material.
15. The apparatus of claim 7, wherein interference fringes are continuously formed in any one of a width direction, a length direction, and an oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
16. An apparatus for manufacturing a diffractive optical element, the apparatus comprising:
a prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with the photoreactive material attachment surface; and
a light source positioned on an opposite side of the prism from the photoreactive material attached to the photoreactive material attachment surface and configured to irradiate light toward the photoreactive material,
wherein the diffractive optical element is manufactured with only one light source without a master by causing illumination light, from which the illumination light is illuminated, to interfere with reflected light, wherein the reflected light is reflected from the light reflecting surface when the illumination light is transmitted through the photoreactive material.
17. A method for manufacturing a diffractive optical element, the method comprising the steps of:
preparing a prism including a photoreactive material attachment surface and a light reflection surface inclined at a predetermined angle with the photoreactive material attachment surface;
attaching a photoreactive material to the prism, on which interference fringes are to be recorded; and
interference fringes are recorded by illuminating light from a light source towards the photoreactive material, the light source being positioned on the opposite side of the prism relative to the photoreactive material.
18. The method of claim 17, wherein the predetermined angle in the step of preparing a prism is determined by the following equation 1,
[ equation 1]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface t For a first incident angle, θ, at which the irradiation light irradiated from the light source is refracted at the interface between air and the photoreactive material and is incident into the photoreactive material d A second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp Refractive index of the photoreactive material, and n p Corresponding to the refractive index of the prism.
19. The method of claim 17, wherein the predetermined angle in the step of preparing a prism is determined by the following equation 2,
[ equation 2]
Wherein θ is p θ is the angle between the light-reactive material attachment surface of the prism and the light-reflecting surface i An irradiation angle θ at which irradiation light irradiated from the light source is incident on an interface between air and the photoreactive material d A second incident angle n at an interface between the prism and the photoreactive material at which reflected light reflected from the light reflecting surface is refracted and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material pp N, the refractive index of the photoreactive material p For the refractive index of the prism, n Air-conditioner Corresponding to the refractive index of air.
20. The method according to claim 17, wherein in the step of recording interference fringes, interference fringes are formed on the photoreactive material by causing irradiation light, which is irradiated from the light source and refracted at an interface between air and the photoreactive material, to interfere with reflected light, which is reflected from the light reflection surface and refracted at an interface between the prism and the photoreactive material, and is incident into the photoreactive material, when the irradiation light is transmitted through the photoreactive material.
21. The method according to claim 17, wherein in the step of recording interference fringes, the irradiation light irradiated from the light source is refracted at an interface between air and the photoreactive material and incident into the photoreactive material at a first incident angle θ t Equal to or less than the total reflection angle theta between the photoreactive material and air c And a second incident angle theta at which the reflected light reflected from the light reflecting surface is refracted at the interface between the prism and the photoreactive material and incident into the photoreactive material when the irradiation light is transmitted through the photoreactive material d Equal to or greater than the total reflection angle theta c 。
22. The method according to claim 17, wherein in the step of recording interference fringes, interference fringes are continuously formed in any one of a width direction, a length direction, and an oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
23. The method of claim 17, further comprising the step of: the photoreactive material or the prism is transmitted such that the photoreactive material is attached to the photoreactive material attachment surface of the prism.
24. The method of claim 23, wherein the photoreactive material is formed in the form of a sheet having a predetermined size in a width direction and extending in a length direction, and the sheet of photoreactive material is continuously transferred in the step of transferring photoreactive material.
25. The method of claim 17, further comprising the step of: a plurality of diffraction optical elements having a predetermined size are cut along any one of a width direction, a length direction, and an oblique direction of the photoreactive material on which the interference fringes are recorded, the oblique direction forming a predetermined angle with the width direction or the length direction.
26. The method of claim 17, wherein the diffractive optical element is a holographic optical element.
27. A photoreactive material on which interference fringes are recorded by causing irradiation light, which is irradiated from the light source by the apparatus for manufacturing a diffractive optical element according to claim 7, to interfere with reflected light, wherein when irradiation light is transmitted through the photoreactive material, reflected light is reflected from the light reflecting surface,
wherein the photoreactive material is formed in the form of a sheet, and
The photoreactive material has interference fringes continuously formed thereon in any one of a width direction, a length direction, and an oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
28. A photoreactive material on which interference fringes are recorded by the method for manufacturing a diffractive optical element according to claim 17,
wherein the photoreactive material is formed in the form of a sheet, and
the photoreactive material has interference fringes continuously formed thereon in any one of a width direction, a length direction, and an oblique direction of the photoreactive material, the oblique direction forming a predetermined angle with the width direction or the length direction.
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| KR1020210093488A KR20230012786A (en) | 2021-07-16 | 2021-07-16 | Holographic optical element manufacturing device and method thereof |
| KR10-2021-0093488 | 2021-07-16 | ||
| PCT/KR2022/010328 WO2023287237A1 (en) | 2021-07-16 | 2022-07-15 | Apparatus and method for manufacturing diffractive optical element |
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| JP2002149044A (en) * | 2000-11-08 | 2002-05-22 | Dainippon Printing Co Ltd | Method of photographing transmission type hologram |
| JP2007160775A (en) * | 2005-12-15 | 2007-06-28 | Konica Minolta Photo Imaging Inc | Method for pasting hologram sensitive material |
| KR102054423B1 (en) * | 2018-02-26 | 2019-12-12 | 광운대학교 산학협력단 | Reflection type holographic optical element and manufacturing method thereof, and screen device with reflection type holographic optical element |
| EP3663833A3 (en) * | 2018-12-05 | 2020-07-29 | HTC Corporation | Waveguide device and optical engine |
| KR102309552B1 (en) | 2020-01-20 | 2021-10-05 | 장지택 | Patient anti-pump bed mattress with ventilation, antibacterial, incineration and anion supply function |
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